Java - jFrame Listeners

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I am trying to make it so when a person starts to type in a textfield it will instantly start to put that text at the end of another textfield. I will be using this for a file path.

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AngelTrs On

To detect and track changes to the text content of a JTextfield, you have to add a DocumentListener to the document of the JTextField.

Please see this Oracle Tutorial: https://docs.oracle.com/javase/tutorial/uiswing/events/documentlistener.html